Out-of-character (OOC) knowledge that is used to influence your In-character (IC) knowledge is strictly forbidden. If you suspect someone might be metagaming, PM one of the STs. We will take it from there. Many times, players aren't aware they are doing it, or perhaps their character knows something you don't. Don't just assume.
If you are confronted for Metagaming, remember we're just trying to keep the game fun and fair. You'll be given an opportunity to explain the justification for your actions.
If you have a hard time keeping IC and OOC knowledge separate, we recommend you do not read threads of which you are not active in.